// console.log(200);
const http = require("http");
let server = http.createServer((req, res) => {
  res.writeHead(200, { "content-type": "text/html" });
  res.end("<h1>hello world</h1>");
});

server.listen(3000, () => {
  console.log("服务启动成功 请访问 http://localhost:3000/");
});
